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How to export the SparkWinLoss Chart to PDF in the .NET MAUI Toolkit Charts

This article explains how to integrate a Syncfusion SfSparkWinLoss Chart in a .NET MAUI Toolkit application and export it as a PDF. The chart is bound to data through a ViewModel, captured as an image stream, and embedded into a Syncfusion PDF document.

Let’s walk through the step-by-step process to achieve this behavior.


Step 1: Create the SparkWinLoss chart with the help of this guideline.
Step 2: Add the Syncfusion.Pdf.Net package to your project.
Step 3: Generate a PDF document for the SfSparkWinLoss chart This step explains how to capture the rendered SfSparkWinLoss as an image and embed it into a PDF using Syncfusion’s PDF library in a .NET MAUI app. The approach works across platforms (Android, iOS, macOS, and Windows) and ensures the exported chart maintains clarity and layout fidelity. 

       private async void SparkWinLossButton_Clicked(object sender, EventArgs e)
       {
           if (sparkwinloss == null)
               return;
           PdfDocument document = new PdfDocument();
           PdfPage page = document.Pages.Add();
           PdfGraphics graphics = page.Graphics;

           float width = (float)sparkwinloss.Width + 75;
           float height = (float)sparkwinloss.Height + 125;

           //To reduce the width and height of the Windows and MAC platform
#if !IOS && !ANDROID
               width = (float)sparkwinloss.Width / 2.5f;
               height = (float)sparkwinloss.Height / 1.5f;
#endif

           PdfImage img = new PdfBitmap((await sparkwinloss.GetStreamAsync(ImageFileFormat.Png)));
           //sparkwinloss.SaveAsImage();
           graphics.DrawImage(img, new RectangleF(0, 0, width, height));
           MemoryStream stream = new MemoryStream();
           document.Save(stream);
           document.Close(true);
           stream.Position = 0;
           SavePDF("SparkWinLossAsPDF.pdf", stream);
           stream.Flush();
           stream.Dispose();
       }

Step 4: Save the PDF document in the default Documents directory.

       private async void SavePDF(string fileName, Stream stream)
       {
           fileName = Path.GetFileNameWithoutExtension(fileName) + ".pdf";

#if ANDROID
           string path = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDocuments).ToString();
#else
       string path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
#endif
           string filePath = Path.Combine(path, fileName);
           using FileStream fileStream = new(filePath, FileMode.Create, FileAccess.ReadWrite);
           await stream.CopyToAsync(fileStream);
           fileStream.Flush();
           fileStream.Dispose();
       }

Note: To save the PDF document on Android and Windows Phone devices, you must enable file writing permissions on the device storage.

Output:

image.png